The struggle with harmer of agricultural production is an important stage of preservation of a crop. Soft sacks widely used for storage and transportation of a grain and products of its processing are one of the main harmer spreading. The existing insection methods of soft sacks are based on application either of chemical preparations (brommetil, inseckticid) or hot air heating a consignment of sacks. In the first case ecology is destroyed and for this reason in the USA the application of chemical reactives [1] are forbidden since 2001, in the second — we have rather energy expenditure technology.

As an alternate way the use of electromagnetic waves of a microwave range [2] for insect soft sacks due to high efficiency of transformation of microwave energy in thermal is of great interest [3].